Minor addition of Li
2O (<2 mass%) can significantly alter the melting temperature and viscosity of a mold flux. However, the crystallization tendency of mold fluxes containing Li
2O more than 2 mass% hasn't been understood. In this paper, single hot thermocouple technique, X-ray diffraction, and Back Scattered Electron (BSE) were employed to investigate the crystallization behavior concerned with CCT and TTT diagrams of mold fluxes containing high content of Li
2O.
The critical cooling rate and crystallization rate of samples were increased with the addition of Li
2O, whether there is Na
2O or not. But the incubation time was reduced obviously with Li
2O more than 6 mass% in mold fluxes. The critical cooling rate and incubation time of NL
1.5 sample (Na
2O=8 mass%, Li
2O=1.5 mass%) were close to those of L
7 sample (Na
2O=0 mass%, Li
2O=7 mass%). Moreover, there is no difference in the crystal phase of the two samples, and the crystal phases precipitated at high temperature and low temperature were respectively Ca
2(SiO
4) and Ca
4Si
2O
7F
2. Li-cuspidine was promoted to precipitate when the basicity of the sample was increased. The small, dense grains of cuspidine were observed in NL
1.5 sample, and the thickness of slag film was 0.4 mm more than that of L
7 sample. The heat flux of NL
1.5 sample measured was 10% less than that of L
7 sample, as expected. Therefore, high content of Li
2O can be substituted by the combination of Na
2O and minor of Li
2O, as is the composition in the commercial mold fluxes.
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